光谱学与光谱分析, 2015, 35 (8): 2348, 网络出版: 2015-08-25  

基于连续光谱光源的单色仪标定方法

Calibration Method for the Monochromator Based on Continuous Spectrum Light Source
作者单位
哈尔滨工业大学仪器科学与技术学科, 黑龙江 哈尔滨 150001
摘要
单色仪在加工和安装过程中不可避免的存在误差,必须对其进行标定后才能使用.传统上采用汞灯的标定方法,波长数量有限,限制了单色仪的标定精度.在研究光栅单色仪原理的基础上,提出了一种基于连续光谱光源的单色仪标定方法,设计并搭建了标定实验系统,系统由宽波段光源、光源电源、滤光片、单色仪、光谱仪及计算机构成.采用卤钨灯作为光源,用光谱仪分别测量卤钨灯经单色仪后的辐射、直接测量卤钨灯的辐射,二者相比得到单色仪透过率函数,消除了卤钨灯辐射以及光谱仪响应函数的影响.在刻度盘的某一读数位置,获得单色仪透过率函数并进行归一化,并计算峰值波长,得到一组峰值波长和刻度盘读数的数据.该方法共采集了22组波长数据,用于单色仪的标定.分别采用8点、14点、18点、22点,采用线性拟合和二次拟合,得到了单色仪的波长与刻度盘读数的关系式.标定点数从8个(8点标定类似于汞灯特征谱标定)增加到22个,误差减小明显,将22点二次拟合的结果作为单色仪最终的标定结果.实验结果表明,采用连续光谱光源的单色仪标定方法获得的标定点数更多,标定结果优于传统的采用汞灯的标定方法.
Abstract
For the inevitable errors of the monochromator in the process of producing and installing,it must be calibrated before being used.For the traditional calibration method using mercury lamp,the number of wavelengths limits the calibration precision of the monochromator.Based on the principle of grating monochromator,calibration method for the monochromator based on continuous spectrum light source is proposed.Calibration system is designed and built,which is composed of broadband light source using tungsten halogen lamp,power source,light filter,the monochromator,spectroscopy to detect the intensity of the monochromator output,and computer.Divide the intensity detected on the output of monochromator by the intensity detected directly the tungsten halogen lamp.The result is the transmissivity function of the monochromator eliminating the influence of the halogen tungsten lamp radiation and the spectrometer response function.On a certain dial number,the transmissivity function is measured,normalized and the peak wavelength is calculated.22 groups of wavelength data and dial number are acquired.8,14,18,22 points are chosen separately to calibrate the relationship between the wavelength and the dial number of monochromator by linear fitting and quadratic fitting.Experimental results show the calibration result in 22 points is better than others,(8 points similar to the calibration method using mercury lamp).The result of quadratic fitting with 22 points as the finalresult is better than linear fitting.So the calibration method for monochromator using the continuous spectrum light source with more calibration points is superior to the traditional calibration method using mercury lamp.

张磊, 戴景民. 基于连续光谱光源的单色仪标定方法[J]. 光谱学与光谱分析, 2015, 35(8): 2348. ZHANG Lei, DAI Jing-min. Calibration Method for the Monochromator Based on Continuous Spectrum Light Source[J]. Spectroscopy and Spectral Analysis, 2015, 35(8): 2348.

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